公开(公告)号：US11795526B2

公开(公告)日：2023-10-24

申请号：US17312626

申请日：2019-11-13

Applicant: JFE Steel Corporation

Inventor： Masahiro Yoshida ,  Takeshi Matsuda ,  Kazuhisa Okai ,  Yusuke Fushiwaki ,  Akira Matsuzaki ,  Daisuke Mizuno

IPC: C22C18/04 ,  C23C22/23

CPC classification number: C22C18/04 ,  C23C22/23

Abstract: A surface-treated steel sheet includes a chemical conversion coating with a thickness of 3.0 μm or less, the chemical conversion coating being placed on a surface of a hot-dip Zn—Al alloy coated steel sheet including a hot-dip Zn—Al alloy coating film containing Al: more than 1.0 mass % and 15 mass % or less, a balance being Zn and inevitable impurities. The chemical conversion coating contains AlH2P3O10.2H2O and a compound containing one or more elements selected from Mg, Ca, and Sr such that a sum of contents of AlH2P3O10.2H2O and the compound is 3.0 mass % to 50 mass %.

公开(公告)号：US20220112579A1

公开(公告)日：2022-04-14

申请号：US17312626

申请日：2019-11-13

Applicant: JFE Steel Corporation

Inventor： Masahiro Yoshida ,  Takeshi Matsuda ,  Kazuhisa Okai ,  Yusuke Fushiwaki ,  Akira Matsuzaki ,  Daisuke Mizuno

IPC: C22C18/04 ,  C23C22/23

Abstract: A surface-treated steel sheet includes a chemical conversion coating with a thickness of 3.0 μm or less, the chemical conversion coating being placed on a surface of a hot-dip Zn—Al alloy coated steel sheet including a hot-dip Zn—Al alloy coating film containing Al: more than 1.0 mass % and 15 mass % or less, a balance being Zn and inevitable impurities. The chemical conversion coating contains AlH2P3O10.2H2O and a compound containing one or more elements selected from Mg, Ca, and Sr such that a sum of contents of AlH2P3O10.2H2O and the compound is 3.0 mass % to 50 mass %.

公开(公告)号：US20240400851A1

公开(公告)日：2024-12-05

申请号：US18698095

申请日：2022-06-17

Applicant: JFE Steel Corporation

Inventor： Shinichi Furuya ,  Takeshi Matsuda ,  Tomohiro Aoyama ,  Shun Koibuchi

IPC: C09D125/14 ,  B05D7/14 ,  C09D5/08 ,  C09D191/06

Abstract: A lubricating film-coated steel sheet to be subjected to complicated forming is disclosed. The organic resin film contains an acrylic resin having a glass transition point (Tg) of 100° C. or higher and an acid value ratio R=acid value (mg-KOH/g)/Tg (° C.) of 1.50 or more, and 5 mass % or more of a polyolefin wax having a melting point of 100° C. or higher and 145° C. or lower and an average particle diameter of 3.0 μm or less, and is formed on a surface of a steel sheet at a coating weight, W, of 0.3 g/m2 or more and 2.5 g/m2 or less per surface.

公开(公告)号：US20230193479A1

公开(公告)日：2023-06-22

申请号：US17925648

申请日：2021-05-18

Applicant: JFE Steel Corporation

Inventor： Yukichika Hashizume ,  Kentaro Hata ,  Takeshi Matsuda

IPC: C23F11/18 ,  C23C22/60 ,  C23C28/00

CPC classification number: C23F11/182 ,  C23F11/185 ,  C23F11/184 ,  C23C22/60 ,  C23C28/321

Abstract: A galvanized steel sheet is covered with an organic resin containing an anticorrosive additive that reduces galvanic current flowing between the zinc coating and the base steel sheet, to thereby considerably suppress intrusion of hydrogen into the steel sheet to prevent delayed fracture of the steel sheet.

公开(公告)号：US10443116B2

公开(公告)日：2019-10-15

申请号：US16082632

申请日：2017-02-16

Applicant: JFE Steel Corporation

Inventor： Katsuya Hoshino ,  Shinichi Furuya ,  Takeshi Matsuda ,  Kazuaki Tsuchimoto ,  Akira Matsuzaki

IPC: C23C22/06 ,  C23C22/53 ,  C23C22/83 ,  C23C2/06 ,  C23C22/34 ,  C23C2/26 ,  C23C22/82

Abstract: Provided is a method for manufacturing a zinc-based coated steel sheet having excellent press formability. The method includes an oxide layer-forming step of bringing the zinc-based coated steel sheet into contact with an acidic solution, holding the zinc-based coated steel sheet for 1 second to 60 seconds, and then water-washing the zinc-based coated steel sheet and a neutralization step of holding a zinc-based oxide layer formed in the oxide layer-forming step for 0.5 seconds or more in such a state that a surface of the zinc-based oxide layer is in contact with an alkaline aqueous solution, water-washing the zinc-based oxide layer, and then drying the zinc-based oxide layer. The acidic solution contains HF2Na and/or HF2K in a total amount of 0.10 g/L to 5.0 g/L.

公开(公告)号：US12234556B2

公开(公告)日：2025-02-25

申请号：US17292076

申请日：2019-10-23

Applicant: JFE STEEL CORPORATION

Inventor： Hayato Takeyama ,  Takeshi Matsuda

IPC: C23C22/78 ,  C21D6/00 ,  C21D9/46 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/20 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/32 ,  C22C38/38 ,  C23C22/34

Abstract: Provided is a low-cost cold rolled steel sheet for zirconium-based chemical conversion treatment that contains Si and Mn and has excellent zirconium-based chemical convertibility even when a relatively large amount of Si-based oxide and Si—Mn-based oxide exists on the steel sheet surface. A cold rolled steel sheet for zirconium-based chemical conversion treatment comprises a chemical composition containing, in mass %, C: 0.05% to 0.30%, Si: 0.01% to 1.4%, Mn: 0.14% to 3.2%, P: 0.10% or less, and S: 0.01% or less, with a balance consisting of Fe and inevitable impurities, wherein a Si/Mn mass ratio in steel is 0.10 to 0.7, and a surface coating ratio of steel sheet surface layer oxides having Si content of 10 mass % or more is 40% or less.

公开(公告)号：US20240101920A1

公开(公告)日：2024-03-28

申请号：US18038753

申请日：2021-10-22

Applicant: JFE Steel Corporation

Inventor： Shinichi Furuya ,  Tomohiro Aoyama ,  Shun Koibuchi ,  Takeshi Matsuda

IPC: C10M111/04 ,  C10M101/02 ,  C10M107/26 ,  C10M107/28 ,  C10M107/34 ,  C10M107/38 ,  C10M107/44

CPC classification number: C10M111/04 ,  C10M101/025 ,  C10M107/26 ,  C10M107/28 ,  C10M107/34 ,  C10M107/38 ,  C10M107/44 ,  C10M2205/0225 ,  C10M2209/0625 ,  C10M2209/0845 ,  C10M2209/1013 ,  C10M2209/1023 ,  C10M2209/1033 ,  C10M2213/0623 ,  C10M2217/0453 ,  C10N2050/02

Abstract: A steel sheet having a film containing an organic resin and a wax on at least one surface of the steel sheet, in which the organic resin is at least one of an acryl-based resin, an epoxy-based resin, a urethane-based resin, a phenol-based resin, a vinyl acetate-based resin, and a polyester-based resin, in which the wax is a polyolefin wax having a melting temperature of 120° C. or higher and 140° C. or lower and an average particle size of 3.0 μm or less, in which a proportion of the wax in the film is 10 mass % or more, and in which a coating weight per side W (g/m2) of the film and an arithmetic average roughness Ra (μm) of the steel sheet satisfy relational expression (1) below.


W≥0.12×Ra2+0.2  (1)

公开(公告)号：US20190093206A1

公开(公告)日：2019-03-28

申请号：US16082632

申请日：2017-02-16

Applicant: JFE Steel Corporation

Inventor： Katsuya Hoshino ,  Shinichi Furuya ,  Takeshi Matsuda ,  Kazuaki Tsuchimoto ,  Akira Matsuzaki

IPC: C23C2/06 ,  C23C2/26 ,  C23C22/34 ,  C23C22/82

CPC classification number: C23C2/06 ,  C23C2/26 ,  C23C22/34 ,  C23C22/82

Abstract: Provided is a method for manufacturing a zinc-based coated steel sheet having excellent press formability. The method includes an oxide layer-forming step of bringing the zinc-based coated steel sheet into contact with an acidic solution, holding the zinc-based coated steel sheet for 1 second to 60 seconds, and then water-washing the zinc-based coated steel sheet and a neutralization step of holding a zinc-based oxide layer formed in the oxide layer-forming step for 0.5 seconds or more in such a state that a surface of the zinc-based oxide layer is in contact with an alkaline aqueous solution, water-washing the zinc-based oxide layer, and then drying the zinc-based oxide layer. The acidic solution contains HF2Na and/or HF2K in a total amount of 0.10 g/L to 5.0 g/L.